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Business Combinations, Goodwill by Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 4,611.3
Goodwill, Translation Adjustments	31.2
Goodwill	4,642.5
Leasing Advisory
Goodwill [Roll Forward]
Goodwill	1,372.6
Goodwill, Translation Adjustments	12.8
Goodwill	1,385.4
Capital Markets Services
Goodwill [Roll Forward]
Goodwill	1,971.5
Goodwill, Translation Adjustments	14.2
Goodwill	1,985.7
Real Estate Management Services
Goodwill [Roll Forward]
Goodwill	961.2
Goodwill, Translation Adjustments	4.0
Goodwill	965.2
Software and Technology Solutions
Goodwill [Roll Forward]
Goodwill	250.1
Goodwill, Translation Adjustments	(0.3)
Goodwill	249.8
Investment Management
Goodwill [Roll Forward]
Goodwill	55.9
Goodwill, Translation Adjustments	0.5
Goodwill	$ 56.4

X

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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